code: def test_neighbors():
      # This test will only pass if the neighbors are exactly correct
      test = np.zeros((5, 7), dtype=np.float64)
      test[:, 3] = 100
  
      expected = np.array(
          [
              [0, 0, 0, 255, 0, 0, 0],
              [0, 0, 0, 255, 0, 0, 0],
              [0, 0, 0, 255, 0, 0, 0],
              [0, 0, 0, 255, 0, 0, 0],
              [0, 0, 0, 255, 0, 0, 0],
          ]
      )
      output = flood_fill(test, (0, 3), 255)
  
      np.testing.assert_equal(output, expected)
  
      test[2] = 100
      expected[2] = 255
  
      output2 = flood_fill(test, (2, 3), 255)
  
      np.testing.assert_equal(output2, expected)
  
file_path: scikit-image/skimage/morphology/tests/test_flood_fill.py
imports: import numpy
  import pytest
  from skimage.morphology import flood, flood_fill
label_desc: Use image node_id 10 for calling a global function with example usage: test_neighbors() without return types